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navik [9.2K]
4 years ago
12

Please help me with answer

Biology
1 answer:
Pachacha [2.7K]4 years ago
7 0

Answer:The Great Oxygenation Event, which occurred around 2.45 billion years ago, was probably the first major extinction event. Since the Cambrian explosion, five further major mass extinctions have significantly exceeded the background extinction rate.

Explanation:

got this from the internet very helpful :)

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